[PATCH 09/11] block: open code create_task_io_context in set_task_ioprio
From: Christoph Hellwig <hch@lst.de>
Date: 2021-12-09 06:31:48
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
The flow in set_task_ioprio can be simplified by simply open coding create_task_io_context, which removes a refcount roundtrip on the I/O context. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/blk-ioc.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 1ba7cfedca2d9..cff0e3bdae53c 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c@@ -291,12 +291,18 @@ int set_task_ioprio(struct task_struct *task, int ioprio) struct io_context *ioc; task_unlock(task); - ioc = create_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE); - if (ioc) { - ioc->ioprio = ioprio; - put_io_context(ioc); + + ioc = alloc_io_context(GFP_ATOMIC, NUMA_NO_NODE); + if (!ioc) + return -ENOMEM; + + task_lock(task); + if (task->io_context || (task->flags & PF_EXITING)) { + kmem_cache_free(iocontext_cachep, ioc); + ioc = task->io_context; + } else { + task->io_context = ioc; } - return 0; } task->io_context->ioprio = ioprio; task_unlock(task);
--
2.30.2